1. ADJ If you describe someone as merciless, you mean that they are very cruel or determined and do not show any concern for the effect their actions have on other people. 冷酷無(wú)情的

...the merciless efficiency of a modern police state. …現(xiàn)代警察國(guó)家冷酷無(wú)情的效率。

2. mercilesslyADV 冷酷無(wú)情地

We teased him mercilessly. 我們毫不同情地取笑他。